Mortising gauge



Jan. 6, 1942. w. s. EDWARDS MORTISING GAUGE Filed Jan. 24, 1941 2 Sheets-Sheet l Jan. 6; 1942. EDW DS 2,268,930

MORTISING GAUGE Filed Jan. 24,1941 2 Sheets-Sheet 2' ,Patented Jan. 6, 1942 MORTI SING' GAUGE William S.- Edwards, Hamden, Conn, assignor to Sargent & Company, New Haven, Conn, a corporation of Connecticut Application January 24, 1941, Serial No. 375,707

7 Claims.

This invention relates to a mortising gauge, and more particularly to a device of this character for use in providing the required openings or mortises in a door for the application of a lock or latch thereto. The particular device disclosed in the present application is adapted especially for the preparation of the door for the mounting of so-called tubular or cylindrical locks.

Locks of this character are ordinarily provided with a tubular or cylindrical case upon the outer end of which is a face plate which projects transversely of the tubular case, and which is adapted to be seated in a shallow mortise in the edge of the door. The case itself is designed to be housed in a bore or tubular opening bored in the edge of the door, while it is also necessary to make a transverse bore from front to back of the door for insertion of the knobs and knob spindles. It is necessary" for the proper operation of the lock that these openings be accurately made, and'that the opening for the lock case be parallel tothe faces of the door while the opening for the knob spindle should be at right angles to the opening for the lock case. The present device may be used not only to position the bit or boring tool at the proper place for the opening, but will also guide the tool so that the openings will be so formed that their axes will be at right angles to the faces of the door from which they are made.

One object of the present invention is to provide a mortising gauge of improved structure for use in connection with the mounting of looks upon doors.

A still further object of the invention isthe provision of a gauge or like device which may be clamped upon a door and serve as a guide to be followed in making the required openings for the mounting of the lock, and which at the same time provides for adjustment so that the gauge may be employed with doors of varying thickness.

A still further objectof the invention is the provision of a mortising gauge in the form of a clamp which may be detachably mounted upon a door, and which device is provided with a slidably adjustable plate containing guide openings for the bit or boring tool, such that the plate may be adjusted not only for doors of varying thicknesses, but also to bring the proper guide openings selectively into position to enable the operator to make the required openings in the door with accuracy and facility.

To these and other ends the invention conto receive the knobs and spindle.

sists in the novel features and combinations of parts to be hereinafter described and shown.

- Inthe accompanying drawings:

Fig. 1 is a front elevational view of my mortis ing gauge applied to the edge of a door;

Fig. 2 is a fragmentary view of the door itself showing the openings madetherein by use of, the improved gauge;

Fig. 3 is a sectional view somewhat reduced in size on line 3-3 of Fig. 1;

Fig. 4 is a sectional view, also reduced, on line 44 of Fig. 1; and

Fig. 5' is a sectional view on line 5-5 of Fig. 1'.

To illustrate a preferred embodiment of my invention, I have shown in Fig. 1 a portion of the edge of a door at H), to which is applied my. improved gauge.

The gauge consists of a body portion of platelike form I l which is adapted to be applied to one face of the door, which portion maybe provided with pads or the like l2 at its upper and lower ends to rest against the door.

At the upper and lower ends of. the member I I are provided L-shaped clamping members each having portions l3 extending across the edge of the door, and transversely extending portions 14 extending rearwardly from the edge along the face of the door, as shown more particularly in Fig. 3. As shown, these clamp arms are formed integrally with'the body portion II, and as they are at the upper and lower ends of the same, the clamp arms are spaced apart a considerable distance. Adjacent their ends the portions I4 of the clamping arms are provided with threaded openings to receive the usual clamp screws l5 having swiveled on their inner ends the disks l6 adapted 'to lie against the face of the door. It will be obvious from reference to Fig. 3, for example, that the construction resembles a pair of spaced C-shaped clamps connected by the plate I l.

Adjacent its central portion the plate H is slightly extended, as shown at IT in Fig. 4, and in this extension is provided an opening within which is placed a sleeve or collar l8. Theposition of the collar I8 is such that, when the surfaces IQ of the clamp portions #3 are set against the edge face of the door, as shown in Fig. 5, the collar l8 provides the proper setback from the edge of the door for the opening It will be apparent that the sleeve l8 being of considerable depth, as shown in Figs. 1 and 3, will properly guide the bit of the boring tool, so that the opening will not only bemade at the proper place on the door, but will also be accurately formed at right angles to the face of the door from which the boring is done.

The opening made through the collar l8, as just described, is shown at in Fig. 2, and in addition to this opening it is necessary to make a cylindrical opening through the edge of the door to house the case of the lock, such as the opening 2| shown in Fig. 2. It is also necessary to make a shallow mortise in the edge of the door to receive the face plate which is normally secured to the lock case, or, in some instances, formed as an integral part thereof. This mortise is commonly made by boring shallow openings 22 and 23, as shown in Fig. 2, one upon each side of the opening 2|, and intersecting the latter opening if the face plate of the lock is relatively short. The mortise may then be completed by chiseling out the material inside the dotted lines 24 and 25 to a depth equal to the depth of the openings 22 and 23. This will provide a mortise for a plate having rounded ends. If the plate is of rectangular shape rather than oval at the ends, additional chiseling operations will be necessary at the upper and lower edges of the openings 23 and 22, respectively, to provide a mortise of rectangular shape.

The present device also provides means for guiding the mechanic in making the openings 2|, 22 and 23 in the face of the door. For this purpose the portions |3 of the clamp arms are provided with L-shaped guide seats 26 and 21, shown more especially in Figs. 1 and 4, which guide seats may be accurately made to slidably and snugly receive a plate 28, the upper and lower edges of which fit between the upper side of the guide seat 26 and the lower side of the guide seat 21. The plate may be adjustably held in place by screws 29 and 30 threaded into the members l3 and carrying washers 3| and 32 which extend over the adjacent edges of the plate 28. It will be apparent that when the screws are backed off to a slight extent the plate may be moved freely along the guideways to the proper position, and retained in such position upon the tightening of the screws.

As shown more particularly in Figs. 1 and 4, this plate is provided with a pair of openings 33 and 34 having shallow guide sleeves 35 and 36 therein, these sleeves being designed to be used when making the bores 22 and 23, as shown in Fig. 2. At a position at one side of these openings and positioned between them vertically of the plate, is another opening 3'l'within which is positioned a relatively deep sleeve 38 to guide the:

bit of the boring tool when the opening 2| is formed. It will, of course, be obvious that after the openings 22 and 23 have been made it will be necessary to adjust the plate 28 to the proper position in order to bore the opening 2|. For example, in Fig. 1 of the drawings the plate 28 is shown in full lines in position to bore the openings 22 and 23, while it is shown in dotted lines, or to the left of the full-line position, in the position occupied when the opening 2| is formed.

As the plate 28 is movable it is necessary to provide means whereby it may be properly set in order that the openings be formed in the center of the edge of the door, or midway between the two faces thereof. Also, as doors vary in thickness, it is advantageous to provide indicia by which the user of the device may at once set the plate in the proper position regardless of the thickness of the door. For this purpose the plate is provided with a number of marks or indicia ill) 39 which cooperate with index members 40 and 4| on the body of the gauge. The marks 39 may correspond respectively to the setting of the plate 28 with doors of thickness of 1%, 1 1% and 1% inches, and the plate 28 will be set so that these marks register with the index marking 40 when the openings 33 and 34 are to be employed. For example, as the device is shown in Fig. 1, the operator is ready to'bore the openings 22 and 23 in a door 1% inches thick. If the door was only 1% inches thick the plate 28 would be moved to the left until the last of the marks 39 registered with the index 40. When the openings 22 and 23 have been bored, the screws 3| and 32 may be loosened and the plate 28 moved to the left until the proper mark 39 registers with the index 4|, at which time the plate 28 will be in the proper position for guiding the bit of the boring tool in forming the opening 2|.

It will be apparent that with the use of the device described the proper boring operations may be accurately performed with reference to the position upon the door at which the lock is to be set, and in addition the openings formed in the door will be made in the proper relation to each other, as the sleeves, and particularly the sleeves l8 and 38, will so guide the bit of the boring tool that the openings will be accurately formed with respect to the door and with respect to each other. Moreover, with the use of the sliding plate 28 the mechanic may not only form the openings 22 and 23, but also the opening 2|, without removing the device from the door, and may use the same gauge regardless of the thickness of the door merely by properly adjusting the plate with respect to the index marks 40 and 4| While I have shown and described a preferred embodiment of my invention, it will be understood that it is not to be limited to all of the details shown, but is capable of modification and variation within the spirit of the invention and within the scope of the appended claims.

What I claim is:

1. A mortising gauge for use in mounting a lock upon a door, said gauge comprising a body member, means for clamping said member upon the door with a portion of the body member disposed against the edge of the door, a slide movably carried by said portion to be shifted horizontally thereon, tool-locating means carried by said slide, a portion of said member extending at right angles to said slide to abut a face of the door, and additional fixed tool-locating means carried by said last-named portion.

2. A mortising gauge for use in mounting a lock upon a door, said gauge comprising a body member, means for clamping said member upon the door with a portion of the body member disposed against the edge of the door, a slide movably carried by said portion to be shifted horizontally thereon, saidslide having a plurality of tool-locating means disposed in spaced relation in the direction of its adjustment for selective use thereof, and cooperating indicia on said slide and member to indicate the adjusted position of the slide, the indicia on one of said parts being spaced to correspond with the spacing of said tool-locating means.

3. A mortising gauge for use in mounting a look upon a door, said gauge comprising a body portion adapted to be disposed against one face of the door, means extending across the edge of the door and against the opposite face thereof to cooperate with said body portion in clamping the device on the door, said body portion having a fixed hollow sleeve extending outwardly therefrom to locate and guide a tool placed therein, a plate adjustably carried by said means extending across the edge of the door for adjustment laterally of said edge, and a plurality of laterally spaced tool-locating means carried by said plate.

4. A mortising gauge for use in mounting a lock upon a door, said gauge comprising a body portion adapted to be disposed against one face of the door, means extending across the edge of the door and against the opposite face thereof to cooperate with said body portion in clamping the device on the door, said body portion having a hollow sleeve extending outwardly therefrom to locate and guide a tool placed therein, a plate adj ustably carried by said means extending across the edge of the door for adjustment laterally of said edge, a plurality of horizontally spaced toollocating means carried by said plate whereby either of said tool-locating means may be adjusted for selective use according to the thickness of the door, and cooperating indicia on said first-named means and plate to indicate adjusted positions of the latter.

5. A mortising gauge for use in mounting a look upon a door, said gauge comprising a body portion adapted to be disposed against one face of the door, spaced L-shaped members extending across the edge of the door and against the opposite face thereof to cooperate with said body portion in clamping the device on the door, said body portion having a fixed hollow sleeve extending outwardly therefrom to locate and guide a tool placed therein, said L-shaped members being provided with facing guideways, a plate adjustably mounted in said guideways and extending across the edge of the door for adjustment laterally of said edge, and tool-locating means secured fixedly to said plate, said lastnamed tool-locating means comprising a hollow sleeve extending outwardly from said plate to receive and guide a tool placed therein.

6. A mortising gauge for use in mounting a look upon a door, said gauge comprising a body portion adapted to be disposed against one face of the door, means extending across the edge of the door and against the opposite face thereof to'cooperate with said body portion in clamping the device on the door, said body portion having a hollow sleeve extending outwardly therefrom to locate and guide a tool placed therein, a plate adjustably carried by said means extending across the edge of the door foradjustment laterally of said edge, and a plurality of tool-locating vmeans on said plate, said means being in spaced relation both vertically and horizontally of the plate for selective use at different levels on said door, and means for securing said plate in various adjusted positions whereby either of saidlocating means may be properly adjusted laterally for doors of different thicknesses.

'7. A mortising gauge for use in mounting a look. upon a door, said gauge comprising a body member adapted to be disposed against one face of the door, a pair of L-shaped members ex--' tending in spaced relation from said body member across the edge of the door and against the opposite face thereof, clamping meanscarried by said L-shaped members to cooperate with the body member to clamp the device on the door, a hollow sleeve carried by said body member and extending outwardly perpendicularly to the plane of the door to guide a tool inserted therein, said L-shaped members being provided with cooperating guideways, a plate slidably mounted in said guideways for adjustment laterally of the edge of the door, a plurality, of laterally spaced tool-locating means carried by said plate, and said plate being adjustable along said guideways to position either of said locating means according to the thickness of the door and to provide for selective use of said locating means WILLIAM S. EDWARDS. 

